linux-kernel - Re: [GIT PULL timers] Timer-wheel bandaids^Wcommits

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Date:	Thu, 30 Jan 2014 11:14:57 +0530
From:	Preeti Murthy <preeti.lkml@...il.com>
To:	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc:	mingo@...nel.org, josh@...htriplett.org,
	Peter Zijlstra <peterz@...radead.org>, oleg@...hat.com,
	rostedt@...dmis.org, bitbucket@...ine.de,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Subject: Re: [GIT PULL timers] Timer-wheel bandaids^Wcommits

Hi Paul,

The commit id:e1d690cdc07637131ba4334: timers: Track total number of
timers in list has
a minor glitch in the changelog.

I am referring to your
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
rcu/timers branch.

"even if ->active_timers is zero, there might well be *non-deferrable*
timers in the list"

s/non-deferrable/deferrable.

Thanks

Regards
Preeti U Murthy

On Thu, Jan 30, 2014 at 5:09 AM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> Hello, Ingo,
>
> This pull request contains latency bandaids^Woptimizations to the
> timer-wheel code that are useful in conjunction with NO_HZ_FULL Kconfig
> option.  These optimizations reduce the jiffy-by-jiffy looping in cases
> where there is either zero or one timers in the timer wheel, which is
> a common case for NO_HZ_FULL "worker" CPUs that run almost entirely
> in usermode for a single task.
>
> Each of these commits has at least two Reviewed-by, one Acked-by, and
> one Tested-by tag, so they are ready for more extensive testing in -tip.
>
>                                                         Thanx, Paul
>
> The following changes since commit 00e2bcd6d35f59fce7fa0e76e24d08f74c6a8506:
>
>   clocksource: Timer-sun5i: Switch to sched_clock_register() (2014-01-19 13:23:23 +0100)
>
> are available in the git repository at:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/timers
>
> for you to fetch changes up to 6f089d0be7fef9705b3a7755b05d1092e772b910:
>
>   timers: Make internal_add_timer() update ->next_timer if ->active_timers == 0 (2014-01-29 15:25:16 -0800)
>
> ----------------------------------------------------------------
> Oleg Nesterov (1):
>       timers: Make internal_add_timer() update ->next_timer if ->active_timers == 0
>
> Paul E. McKenney (4):
>       timers: Track total number of timers in list
>       timers: Reduce __run_timers() latency for empty list
>       timers: Reduce future __run_timers() latency for newly emptied list
>       timers: Reduce future __run_timers() latency for first add to empty list
>
>  kernel/timer.c | 30 ++++++++++++++++++++++++++++--
>  1 file changed, 28 insertions(+), 2 deletions(-)
>
> --
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